23 April 2017 High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103235L (2017) https://doi.org/10.1117/12.2267641
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
We propose a high speed strain measurement method using an active mode locking (AML) fiber Bragg grating (FBG) laser sensor with a chirped FBG cavity. The mode-locked frequency of the AML laser depends on both the position and Bragg wavelength of the FBG. Thus, the mode-locked frequency of cascaded FBGs can be detected independently along the cavity length of cascaded FBGs. The strain across FBGs can be interrogated dynamically by monitoring the change in mode-locked frequency. In this respect, the chirped FBG critically improves the frequency sensitivity to Bragg wavelength shift as a function of increasing dispersion in the AML cavity. The strain measurement of the FBG sensor shows a highly linear response, with an R-squared value of 0.9997.
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Gyeong Hun Kim, Gyeong Hun Kim, Joon Young Kim, Joon Young Kim, Chang Hyun Park, Chang Hyun Park, Chang-Seok Kim, Chang-Seok Kim, Hwi Don Lee, Hwi Don Lee, Youngjoo Chung, Youngjoo Chung, } "High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235L (23 April 2017); doi: 10.1117/12.2267641; https://doi.org/10.1117/12.2267641
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